Question

What viruses cause warts?

Answer 1

Human papillomavirus (HPV). More than 100 types of HPV exist, but only a few cause warts on your hands.

Explanation:

Each person's immune system responds to the HPV virus differently, so not everyone who comes in contact with HPV develops warts.
https://www.mayoclinic.org/diseases-conditions/common-warts/symptoms-causes/syc-20371125